Hans karplus



Patented Mar. 26, 1929.

UNITED STATES 1,707,164 '?A;'l"ENT OFFICE.

HANS KARPLUS, FRANKFORT-ON-THE-MAIN,

MANUFACTURE OF HOLLOW ARTIFICIAL TEXTILE THREADS.

No Drawing. Application filed August 27, 1926, Serial ITo. 132,043, andin Czechoslovakia September It is already known to produce hollowtificial textile threads by spinning solutionsin which gases areeinulsiioned or dissolved, or into which a substance has been introducedwhich, like for instance sodium carbonate, on

leaving the spinning nozzle can produce gas the hollow threads or bubblethreads thus produced, have the great drawback that for instance whentreated with warm baths or when dried in warm air, as is unavoidable forthe finishing of the textile material, they do not withstand well theaction of such increased temperatures, the gas bubbles already containedin the freshly spun thread, expanding namely to a great extent duringsuch treatment in the heat and causing frequent bursting, that is to saythe enclosing iibre layer is broken by the expanding gas bubbles.

It has 110w been found that hollow artificial textile structures can beobtained without these heavy drawbacks, by incorporating in the spinningsolutions liquid or solid substances which during the whole of the following spinning and finishing process, can not develop anybubl'ile-iforming vapour or gases, namely neither under any tl'ierlnicnor chemical. action. Owing to the absence of this vapour or gasgeneration, the risk of a bursting oi the gas bubbles occluded in thethread is avoided. The substances incorporated are removed from the spunthread only subsequently, namely by dissolving them out with a suitablesolvent. As the spinning solutions there could be used any cellulosesolution, such as viscose and copper-oxideaininonia solutions, furthersolutions of nitrocellulose and acctyl cellulose.

The process is carried out by finely distributing solid or liquidsubstances which are insoluble to a large extent or completely in thespinning solutions, in the said solutions if necessary to the colloidaldispersity de gree. As substances suitable for the present process, thatis to, say which do not generate during the process of manufacture ofthe threads any bubble forming vapour or gases in the said threadseither under the thermic or chemical action, may be mentioned by way ofexample, for the viscose process; mineral, animal or vegetable oils suchas lubricating oil, parallin oil; further ininerahvegetable and animalfats, waxes and the lil;e ,'turther solid paratiin, metal soaps, fattyacids, naphthenic acids, resins. Such substances can be easilyemulsionedor suspended in the spin ning solution in a state of such afine division that the spinning process is in no way affected by theirpresence. The spun threads are submitted in the well known manner to asubsequent treatment and the incorporated substances are finally removedby dissolving them out by means of a suitable solvent. This dissolvingout of the incorporated substances finely distributed or divided liquidor solid substances within the threads only during the spinning process,more particularly under the chemical action of the precipitation bath.These added substances, or these substances separating in a state ofline division, must be again chosen in such a manner that a vapour orgas generation during the process of manu'li'acture of the threads isavoided. vVhen employing viscose as the spinning solution, as additionalsubstances, could be used for instance alkali salts of fatty acids,rcsinic acids or their hydroxylizcd or sulphonated products. Theseadditional substances, first dissolved in the viscose, are decomposedonly by the action oi"- the precipitation bath and separate free fattyacids, resinic acids etc., in a finely divided state. The addition ofsoaps to the viscose has already been recommended, but the substancesseparated by the decomposing precipitation bath, are retained completelyor to a large extent in the thread. According to the present processhowever, these separated, finely divided substances, are subsequentlydissolved out again by means of a suitable solvent such as for instanceorganic solvents, or by a suflicient treatment with alkaline baths, inorder to enable the desired hollow cells or bubbles to be producedin'thc thread.

Ewamplc J.-22 gr. bone oil or paraffin oil are finely emulsioned in 400gr. of viscose. The spinning solution obtained is spun in the Well knownmanner in acid salt baths, the threads obtained are Washed and dried.The incorporated oi] particles are then extracted by means of benzol,carbon sulphide amyl alcohol. A textile thread of great lightness andsoftness is then produced, permeated by hollow spaces and showing goodstructure and. strength.

Example 9.25 gr. sodium oleate are dissolved in 400 gr. of viscose. Thespinning solution obtained is spun as set forth in the Example 1, andsubmitted to subsequent treatment. The oleic acid separated in thethread produced in a state of fine division, by the action of theprecipitating bath is dissolved out by benzin or by a 5% solution ofsoda lye.

I claim:

1. A process for the manufacture of hollow artificial textile threads ofinterior hollow cellular structure from spinning solutions of anydesired kind such as for instance, viscose, copper-oXide-annnonia,celluloseacetate, nitro-cellulose solutions, comprising incorporatinginto the solution to be spun, liquid or solid organic, non-crystallinesubstances which, during the Whole following spinning and finishingprocess of the threads, cannot form any bubbleiorming vapours or gases,and subsequently removing the said substances from the textile threadsby means of suitable solvents.

2. A step in the process as claimed in claim 1, comprising distributingthe substances incorporated in the spinning solution as emulsions orsuspensions in said solution, eventually up to colloidal fineness.

In testimony whereof I have signed my name to this specification.

HANS KARPLUS.

